THE PRODUCTS ARE INTENDED ONLY FOR USE AS DESCRIBED. For use of the individual components when dispensed as medications outside this combination package for treating urinary tract infections (UTI), please see the package inserts for the individual products.

Trimethoprim is 2,4-pyrimidinediamine, 5-[(3,4,5-trimethoxyphenyl)methyl]. It is a white to light yellow, odorless, bitter compound with a molecular weight of 290.32, the molecular formula C14H18N4O3. Its structual formula is:

Sulfamethoxazole is benzenesulfonamide, 4-amino-N-(5-methyl-3-isoxazolyl). It is an almost white, odorless, tasteless compound with a molecular weight of 253.28, the molecular formula C10H11N3O3S. Its structual formula is: